At an altitude of 3 times the radius of the Earth, the acceleration due to gravity is
a. g/3.
c. g/27.
b. g/9.
d. not given.
D
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A bullet of mass 0.010 kg and speed of 200 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. This process takes 0.02 second. The magnitude of the impulse delivered to the bullet by the block during this time is
A. 0.98 N. B. 2.0 Ns. C. 1.0 Ns. D. zero. E. 4.0 Ns.
A grandfather clock that is regulated by a pendulum is orbiting the Earth aboard the space station. Compared to an identical clock on Earth, the grandfather clock aboard the space station will
A. run fast. B. not run at all. C. run slow. D. keep time at the same rate.
A big defensive lineman picks up a fumbled football and begins rumbling toward the end zone. His mass is 150 kg, and his velocity is 6.0 m/s, west. A brave wide receiver, whose mass is 90 kg, must stop that lineman and he is right in the lineman's path, so it has to be a head-on collision. How fast must the wide receiver be running if he wants to drop the lineman in his tracks and save the day?
A. 88 mph B. 10 m/s C. 0.60 m/s D. 8.3 m/s
Most stars in the Milky Way's halo are
A) very old. B) found inside molecular clouds. C) very young. D) blue or white in color.